EVOLUTION OF WIRELESS COMMUNICATION. SHUSHRUTHA K S. AMPS. The Advanced Mobile Phone System is one of the earliest commercial cellular systems.
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Since no cellular service provider covers the entire country,
Mobile carriers must provide service to one another's customers for those customers to be able to receive service whenever they are outside of their home area. This capability to receive service while in another service provider's domain is called roaming.
All signalling between systems was proprietary in nature and the roaming capability had to be manually administered.
In early years, intercarrier business relationships sometimes abused the customers' need for roaming, with service providers sometimes surprising subscribers with excessive "roaming charges." This has cost the cellular industry much in terms of reputation and customer relations.